{"id":"F2006B09122","name":"AD/DHC-6/34 - Pilot Seats Safety Restraint Installations - Modification","slug":"ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115675,"registerId":"commonwealth-F2006B09122-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-6/34 - Pilot Seats Safety Restraint Installations - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHC-6 (Twin Otter) Series Aeroplanes\n\n \n\nAD/DHC-6/34 Pilot Seats Safety Restraint Installations - Modification\n\n\n9/72\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Modify each front (pilot) seat restraint installation by fitting a safety harness in accordance with a scheme approved by the Secretary.\n\n \n\nNote: Guidelines for installation schemes are outlined in Airworthiness Advisory Circular No. 62 dated March 1972.\n\n \n\nCompliance: Before 1 October 1973.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1340},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope focused solely on mandating safety harness installation for pilot seats in a specific aircraft type."},"complexity_factors":["Single, unambiguous operational requirement","No defined terms or interpretation sections","Minimal cross-referencing (only one advisory circular)","Clear applicability with no exceptions or conditions"],"plain_english_summary":"**What this does:** This is a safety mandate requiring operators of DHC-6 Twin Otter aircraft to upgrade the pilot seatbelts to full safety harnesses.\n\n**Who it affects:** Owners and operators of all DHC-6 (Twin Otter) series aircraft.\n\n**Key requirements:**\n*   **The modification:** Each front (pilot) seat must be fitted with a proper safety harness restraint system (not just a simple lap belt).\n*   **Approval needed:** The installation scheme must be approved by the Secretary (the relevant government authority official).\n*   **Guidelines:** Installation guidance is available in Airworthiness Advisory Circular No. 62 (March 1972).\n*   **Deadline:** The work had to be completed before 1 October 1973.\n\n**Why it matters:** This improves pilot protection during turbulence, hard landings, or accidents by ensuring pilots remain properly secured at their controls."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification","history":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification/history","analysis":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification/analysis","conflicts":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification/conflicts","importantCases":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification/important-cases","documents":"/api/acts/ad-dhc-6-34-pilot-seats-safety-restraint-installations-modification/documents"}}